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HK: Physik der Hadronen und Kerne

HK 10: Poster Session: Nuclear Structure/Spectroscopy

HK 10.24: Poster

Dienstag, 9. März 2004, 13:30–15:30, Foyer

Signature inversion in the semidecoupled π h_9/2 ⊗ ν i_13/2 band of the odd-odd nucleus ¹⁷²Lu — •Ts. Venkova^1,2, R.M. Lieder¹, W. Gast¹, D. Bazzacco³, G. de Angelis⁴, E.O. Lieder¹, H.M. Jäger¹, L. Mihailescu¹, R. Menegazzo³, S. Lunardi³, C. Rossi Alvarez³, C. Ur³, D.R. Napoli⁴, W. Urban⁵, and T. Rzaca-Urban⁵ — ¹IKP, FZ Jülich, D-52425 Jülich — ²INRNE, BAS, BG-1784 Sofia — ³INFN, Sezione di Padova, I-35131 Padova — ⁴INFN, LNL, I-35020 Legnaro — ⁵IEP, Univ. Warsaw, PL-00-681 Warsaw

High-spin states in the odd-odd nucleus ¹⁷²Lu have been populated in a ¹⁷⁰Er(⁷Li,5n) reaction at 51 MeV and the emitted γ-radiation was detected with the GASP array. A new semidecoupled band with the proposed π 1/2⁻[541] ⊗ ν 7/2⁺[633] configuration has been established exhibiting a signature inversion up to the highest observed spin, since contrary to expectation, the states with the signature α=0 lie lower in energy than the α=1 levels.

From a systematics of the inversion spin, at which the signature splitting reverts to the normal order, for π h_9/2 ⊗ ν i_13/2 bands of odd-odd nuclei with 69 ≤ Z ≤ 79 and 93 ≤ N ≤ 105 it was found that the inversion spin is fairly constant for nuclei with the same N−Z, that for an isotopic chain the inversion spin increases with increasing neutron number N and that for an isotonic chain, the inversion point decreases with increasing proton number Z.

The work was partly supported by the DFG under the grants 436 BUL 17/7/02 and 17/6/03 and by the EU contracts ERB-FMGEST-980110 and HPRI-CT-1999-00083.